CN116846431A

CN116846431A - Codebook feedback and determination method and device for multiple Transmission and Reception Points (TRPs)

Info

Publication number: CN116846431A
Application number: CN202210284532.7A
Authority: CN
Inventors: 马大为
Original assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2023-10-03
Also published as: WO2023179587A1

Abstract

The application provides a codebook feedback and determination method and device for multiple TRPs, wherein the method comprises the following steps: and acquiring a reference signal to be measured, measuring the reference signal to be measured, and determining and sending codebook feedback parameters according to the measurement result. Wherein, the reference signal to be measured is used for measuring channel states of a plurality of TRPs, and the codebook feedback parameters comprise: the system comprises a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups. By the scheme provided by the application, the network side equipment can determine the available codebook supporting the coherent joint transmission of a plurality of TRPs.

Description

Codebook feedback and determination method and device for multiple Transmission and Reception Points (TRPs)

Technical Field

The present application relates to the field of communications technologies, and in particular, to a codebook feedback method and apparatus for multiple TRPs, a codebook determining method and apparatus, and a computer readable storage medium.

Background

Currently, a New Radio (NR) system introduces a coherent joint transmission (Coherent Joint Transmission, CJT) mechanism. Under the cqt mechanism, the network side device may perform coherent joint transmission with the terminal through a plurality of transmission reception points (Transmitter Receiver Point, abbreviated as TRP). There is currently no codebook feedback scheme supporting coherent joint transmission of multiple TRPs.

Disclosure of Invention

The technical problem solved by the application is to provide a codebook feedback and determination method and device for multiple Transmission Receiving Points (TRPs), which can enable network side equipment to determine an available codebook supporting multiple TRPs for coherent joint transmission.

In order to solve the above technical problem, an embodiment of the present application provides a codebook feedback method for multiple TRP, where the method is applied to a terminal, and includes: acquiring a reference signal to be measured, wherein the reference signal to be measured is used for measuring channel states of a plurality of TRPs; measuring the reference signal to be measured, and determining codebook feedback parameters according to a measurement result, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two space-domain beam groups, the at least two space-domain beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two space-domain beam groups, and the at least two TRPs are at least two TRPs in the plurality of TRPs; and sending the codebook feedback parameters.

Optionally, the codebook feedback parameter further includes: a third parameter for indicating at least one frequency domain beam group, the at least one frequency domain beam group corresponding to the at least two TRPs.

Optionally, the first parameter includes: index information and beam vector rotation factors for each spatial beam group.

Optionally, the method further comprises: transmitting a resource index of a reference signal to be measured corresponding to at least one airspace beam group; wherein the at least one spatial beam set is at least a portion of the at least two spatial beam sets.

Optionally, the second parameter includes: the position, amplitude and phase of the non-zero coefficients in the weighting coefficient matrix corresponding to each spatial beam group.

Optionally, the second parameter includes: the position parameters are used for indicating the positions of non-zero coefficients in the weighting coefficient matrixes corresponding to the at least two airspace beam groups; index of multiple reference coefficients corresponding to multiple weighting coefficient matrixes, wherein the index of each reference coefficient is used for indicating the position of the reference coefficient in the weighting coefficient matrix to which the reference coefficient belongs, and each reference coefficient is the coefficient with the largest amplitude in the weighting coefficient matrix to which the reference coefficient belongs; each group of first differential parameters is used for indicating the differential amplitude and the differential phase of other non-zero coefficients except the reference coefficient in the corresponding weighting coefficient matrix relative to the reference coefficient; an index of a strongest coefficient, the index of the strongest coefficient being used to indicate a position of the strongest coefficient among the plurality of reference coefficients, wherein the strongest coefficient is a reference coefficient with a largest magnitude among the plurality of reference coefficients; and a plurality of second differential parameters corresponding to the plurality of weighting coefficient matrixes, wherein each second differential parameter is used for indicating the differential amplitude and the differential phase of the reference coefficient relative to the strongest coefficient in the corresponding weighting coefficient matrix.

Optionally, sending the feedback parameter includes: sequentially mapping the codebook feedback parameters to feedback channels according to the sequence of the first group, the second group and the third group and sending the codebook feedback parameters; wherein group one includes: an index of the first parameter, the strongest coefficient; the second group comprises: index of reference coefficient corresponding to at least one weighting coefficient matrix, first differential parameter and second differential parameter of the at least one weighting coefficient matrix; group three includes: index of reference coefficient corresponding to other weighting coefficient matrixes except the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes, and first differential parameter and second differential parameter of the other weighting coefficient matrixes; alternatively, group one includes: the first parameter, the index of the strongest coefficient and the indexes of the reference coefficients corresponding to the weighting coefficient matrixes; the second group comprises: the first differential parameter and the second differential parameter correspond to the at least one weighting coefficient matrix; group three includes: and the first differential parameters and the second differential parameters corresponding to the weighting coefficient matrixes except for the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes.

Optionally, the number of the reference signals to be measured is plural, the reference signals to be measured and the TRP are in one-to-one correspondence, and each reference signal to be measured is sent by the TRP corresponding to the reference signal to be measured.

In a second aspect, an embodiment of the present application further provides a multi-TRP codebook feedback apparatus, the apparatus including: the acquisition module is used for acquiring a reference signal to be measured, wherein the reference signal to be measured is used for measuring channel states of a plurality of TRPs; the parameter generation module is used for measuring the reference signal to be measured and determining codebook feedback parameters according to the measurement result, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two space-domain beam groups, the at least two space-domain beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two space-domain beam groups, and the at least two TRPs are at least two TRPs in the plurality of TRPs; and the sending module is used for sending the codebook feedback parameters.

Optionally, the apparatus further includes: the resource index transmitting module is used for transmitting the resource index of the reference signal to be measured corresponding to at least one airspace beam group; wherein the at least one spatial beam set is at least a portion of the at least two spatial beam sets.

Optionally, the sending module includes: the sequential sending sub-module is used for mapping the codebook feedback parameters to feedback channels in sequence according to the sequence of the first group, the second group and the third group and sending the codebook feedback parameters; wherein group one includes: an index of the first parameter, the strongest coefficient; the second group comprises: index of reference coefficients of at least one weighting coefficient matrix, a first differential parameter and a second differential parameter of the at least one weighting coefficient matrix; group three includes: index of reference coefficient of other weighting coefficient matrix except the at least one weighting coefficient matrix, first differential parameter and second differential parameter of the other weighting coefficient matrix in the plurality of weighting coefficient matrixes; alternatively, group one includes: the first parameter, the index of the strongest coefficient, and the index of the plurality of reference coefficients; the second group comprises: a first differential parameter and a second differential parameter of at least one weighting coefficient matrix; group three includes: a first differential parameter and a second differential parameter of other weighting coefficient matrices of the plurality of weighting coefficient matrices than the at least one weighting coefficient matrix.

In order to solve the above technical problem, an embodiment of the present application further provides a codebook determining method for multiple transmission receiving points TRP, where the method is applied to a network side device, and includes: receiving codebook feedback parameters, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, where the first parameter is used to indicate at least two spatial beam groups, the at least two spatial beam groups respectively correspond to at least two TRPs, and the second parameter is used to indicate a weighting coefficient matrix corresponding to the at least two spatial beam groups, and determine a feedback codebook of the at least two TRPs according to the codebook feedback parameter; wherein the codebook feedback parameter is determined according to a measurement result of channel states of the plurality of TRPs, and the at least two TRPs are at least two TRPs of the plurality of TRPs.

Optionally, before receiving the codebook feedback parameter, the method further includes: transmitting a reference signal to be measured and indicating to perform codebook feedback; wherein the reference signal to be measured is used for measuring channel states of the plurality of TRPs.

Optionally, the method further comprises: receiving a resource index of a reference signal to be measured corresponding to at least one airspace beam group; wherein the at least one spatial beam set is at least a portion of the at least two spatial beam sets.

Optionally, the feedback parameters are mapped to the feedback channels in sequence of the first group, the second group and the third group and sent; wherein group one includes: an index of the first parameter, the strongest coefficient; the second group comprises: index of reference coefficient corresponding to at least one weighting coefficient matrix, first differential parameter and second differential parameter of at least one weighting coefficient matrix; group three includes: index of reference coefficient corresponding to other weighting coefficient matrixes except the at least one weighting coefficient matrix, and first differential parameter and second differential parameter of other weighting coefficient matrixes; alternatively, group one includes: the first parameter, the index of the strongest coefficient and the indexes of the reference coefficients corresponding to the weighting coefficient matrixes; the second group comprises: the first differential parameter and the second differential parameter correspond to the at least one weighting coefficient matrix; group three includes: and the first differential parameters and the second differential parameters corresponding to the weighting coefficient matrixes except for the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes.

In a fourth aspect, an embodiment of the present application further provides a codebook determining apparatus for multiple transmission-reception points TRP, the apparatus including: the receiving module is configured to receive codebook feedback parameters, where the codebook feedback parameters include: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups; a determining module, configured to determine a feedback codebook of the at least two TRPs according to the codebook feedback parameter; wherein the codebook feedback parameter is determined according to a measurement result of channel states of the plurality of TRPs, and the at least two TRPs are at least two TRPs of the plurality of TRPs.

Optionally, the device further includes a signal sending module, configured to send a reference signal to be measured before receiving the codebook feedback parameter, and instruct codebook feedback to be performed; wherein the reference signal to be measured is used for measuring channel states of the plurality of TRPs.

Optionally, the apparatus further includes: the resource index receiving module is used for receiving the resource index of the reference signal to be measured corresponding to at least one airspace beam group; wherein the at least one spatial beam set is at least a portion of the at least two spatial beam sets.

Optionally, the second parameter includes: the position parameters are used for indicating the positions of non-zero coefficients in a plurality of weighting coefficient matrixes corresponding to the at least two airspace beam groups; index of multiple reference coefficients corresponding to multiple weighting coefficient matrixes, wherein the index of each reference coefficient is used for indicating the position of the reference coefficient in the weighting coefficient matrix to which the reference coefficient belongs, and each reference coefficient is the coefficient with the largest amplitude in the weighting coefficient matrix to which the reference coefficient belongs; each group of first differential parameters is used for indicating the differential amplitude and the differential phase of other non-zero coefficients except the reference coefficient in the corresponding weighting coefficient matrix relative to the reference coefficient; an index of a strongest coefficient, the index of the strongest coefficient being used to indicate a position of the strongest coefficient among the plurality of reference coefficients, wherein the strongest coefficient is a reference coefficient with a largest magnitude among the plurality of reference coefficients; and a plurality of second differential parameters corresponding to the plurality of weighting coefficient matrixes, wherein each second differential parameter is used for indicating the differential amplitude and the differential phase of the reference coefficient relative to the strongest coefficient in the corresponding weighting coefficient matrix.

Optionally, the feedback parameters are mapped to the feedback channels in sequence of the first group, the second group and the third group and sent; wherein group one includes: an index of the first parameter, the strongest coefficient; the second group comprises: index of reference coefficient corresponding to at least one weighting coefficient matrix, first differential parameter and second differential parameter of the at least one weighting coefficient matrix; group three includes: index of reference coefficient corresponding to other weighting coefficient matrixes except the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes, and first differential parameter and second differential parameter of the other weighting coefficient matrixes; alternatively, group one includes: the first parameter, the index of the strongest coefficient and the indexes of the reference coefficients corresponding to the weighting coefficient matrixes; the second group comprises: the first differential parameter and the second differential parameter correspond to the at least one weighting coefficient matrix; group three includes: and the first differential parameters and the second differential parameters corresponding to the weighting coefficient matrixes except for the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes.

In a fifth aspect, embodiments of the present application further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described codebook feedback method for multi-TRP or the steps of the above-described codebook determination method for multi-TRP.

In a sixth aspect, an embodiment of the present application further provides another codebook feedback device for multiple TRP, including a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor executes the steps of the codebook feedback method for multiple TRP described above when running the computer program.

In a seventh aspect, an embodiment of the present application further provides another codebook determining apparatus for multiple TRP, including a memory and a processor, where the memory stores a computer program executable on the processor, and the processor executes the steps of the codebook determining method for multiple TRP when the processor runs the computer program.

In an eighth aspect, embodiments of the present application also provide a computer program product comprising a computer program for causing a computer to carry out the steps of the above method when the computer program is run on the computer.

In a ninth aspect, an embodiment of the present application further provides a communication system, including a terminal and a network side device for executing the above method.

In a tenth aspect, embodiments of the present application further provide a chip on which a computer program is stored, which when executed by the chip, implements the steps of the above method.

Compared with the prior art, the technical scheme of the embodiment of the application has the following beneficial effects:

in the scheme of the embodiment of the application, the channel states of a plurality of TRPs are measured to obtain a measurement result, and the codebook feedback parameters can be determined according to the measurement result. The codebook feedback parameters may include a first parameter for indicating at least two spatial beam groups corresponding to at least two TRPs, respectively, and a second parameter for indicating a weighting coefficient matrix corresponding to the at least two spatial beam groups, and thus the spatial beam groups and the corresponding weighting coefficient matrices of the at least two TRPs may be determined according to the codebook feedback parameters. Further, since the codebook feedback parameter is determined simultaneously according to the measurement results of the channel states of the plurality of TRPs, the at least two TRPs may be used for coherent joint transmission. By the scheme provided by the embodiment of the application, the terminal can feed back the available codebook supporting the coherent joint transmission of a plurality of TRPs to the network side equipment.

Drawings

Fig. 1 is a flowchart of a codebook feedback method for multi-TRP according to an embodiment of the present application;

Fig. 2 is a schematic diagram of a codebook feedback apparatus for multi-TRP according to an embodiment of the present application;

fig. 3 is a schematic diagram of a codebook determining apparatus for multi-TRP according to an embodiment of the present application;

fig. 4 is a schematic diagram of another codebook feedback device for multi-TRP according to an embodiment of the present application.

Detailed Description

The scheme of the embodiment of the application can be applied to 5G (Generation) communication systems, 4G and 3G communication systems and various future communication systems, such as 6G and 7G. The network element comprises network side equipment and a terminal. The network side equipment and the terminal can perform uplink and downlink communication.

The network side device in the embodiment of the application can be a device which is deployed in a wireless access network and used for providing a wireless communication function. Such as a Base Station (BS) for short (also referred to as base station equipment). The base station may be, for example, a base Radio transceiver station (base transceiver station, abbreviated BTS), a base station controller (base station controller, abbreviated BSC) in a 2G network, a node B (NodeB) in a 3G network, a Radio network controller (Radio network controller, abbreviated RNC), an evolved node B (eNB) in a 4G network, an Access Point (AP) in a wireless local area network (wireless local area networks, abbreviated WLAN), a next generation base station node B (gNB) in a 5G New Radio (NR), and an apparatus for providing a base station function in a future New communication system.

A terminal in an embodiment of the present application may refer to various forms of User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a Mobile Station (MS), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device (terminal equipment), a wireless communication device, a user agent, or a user equipment. The terminal may also be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved public land mobile network (Public Land Mobile Network, PLMN) and so on, as well as embodiments of the present application are not limited in this regard.

The technical scheme of the application is also applicable to different network architectures, including but not limited to a relay network architecture, a double link architecture and a Vehicle-to-evaluation (communication from a Vehicle to any object) architecture.

As described in the background, there is currently no codebook feedback scheme supporting coherent joint transmission of multiple TRPs. In a coherent joint transmission mode, the transmitting antennas of a plurality of TRPs have coherent characteristics, and downlink data is transmitted to a terminal by adopting phase interference coding.

In particular, a type II port selection codebook is defined in the third generation partnership project (3 rd Generation Partnership Project, 3GPP for short) Rel-16 stage, but the existing type II port selection codebook only supports the scenario that a terminal performs data transmission with a single TRP. In the scenario of coherent joint transmission of multiple TRPs, it is necessary to enhance the existing type II port selection codebook, and the enhanced codebook needs to be able to indicate the spatial and frequency domain beams selected for the multiple TRPs involved in the coherent joint transmission. For the enhanced codebook, how the terminal feeds back to the network side device has not yet existed a solution.

In order to solve the above technical problems, an embodiment of the present application provides a codebook feedback method for multiple TRPs, where in the scheme of the embodiment of the present application, channel states of multiple TRPs are measured to obtain a measurement result, and a codebook feedback parameter can be determined according to the measurement result. The codebook feedback parameters may include a first parameter for indicating at least two spatial beam groups corresponding to at least two TRPs, respectively, and a second parameter for indicating a weighting coefficient matrix corresponding to the at least two spatial beam groups, and thus the spatial beam groups and the corresponding weighting coefficient matrices of the at least two TRPs may be determined according to the codebook feedback parameters. Further, since the codebook feedback parameter is determined simultaneously according to the measurement results of the channel states of the plurality of TRPs, the at least two TRPs may be used for coherent joint transmission. By the scheme provided by the embodiment of the application, the terminal can feed back the available codebook supporting the coherent joint transmission of a plurality of TRPs to the network side equipment.

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 1, fig. 1 is a flowchart illustrating a codebook feedback and determination method for multi-TRP according to an embodiment of the present application. The actions executed by the terminal can be executed by a chip with a feedback parameter generating function in the terminal, can be executed by a baseband chip in the terminal, and the actions executed by the network side device can be executed by a chip with a codebook calculating function in the network side device, and can be executed by the baseband chip in the network side device. The method illustrated in fig. 1 may comprise the steps of:

s101: the network side equipment configures reference signal resources to be measured, wherein the reference signal to be measured is used for measuring channel states of a plurality of TRPs. In the present application, S in each step number represents a step (step).

S102: the network side equipment sends a reference signal to be measured. Accordingly, the terminal acquires (e.g., receives) the reference signal to be measured. In a specific implementation, the network side device may further instruct the terminal to perform codebook feedback for coherent joint transmission.

S103: the terminal measures the reference signal to be measured and determines codebook feedback parameters according to the measurement result, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups;

s104: and the terminal sends the codebook feedback parameters. Correspondingly, the network side equipment receives the codebook feedback parameters.

S105: and the network side equipment determines the feedback codebook of the at least two TRPs according to the codebook feedback parameters.

In a specific implementation of S101, a network-side device (e.g., may be a base station) may configure a channel state information Reference Signal (CSI-RS) resource for channel measurement.

In particular, the network-side device may include a plurality of TRPs, which may be noted as a plurality of candidate TRPs, which may be located in different geographical locations. Wherein the plurality of candidate TRPs may be configured by a network side device. The network side device may transmit reference signals to be measured (i.e., CSI-RS) to the terminal through a plurality of candidate TRPs to measure channel states between the respective candidate TRPs and the terminal.

In a specific embodiment, the reference signals to be measured may correspond to the candidate TRPs one by one, and each reference signal to be measured may be transmitted to the terminal through the corresponding candidate TRP.

In the implementation of S102, the network side device may send a plurality of reference signals to be measured to the terminal and instruct the terminal to perform codebook feedback for coherent joint transmission. More specifically, each reference signal to be measured may be transmitted to the terminal through its corresponding candidate TRP.

In a specific implementation of S103, the terminal may measure each received reference signal to be measured. By measuring the reference signal to be measured transmitted by each candidate TRP, channel estimation can be performed on the channel state between the terminal and each candidate TRP, thereby obtaining a plurality of channel matrices. Thus, channel matrices may also be in one-to-one correspondence with the candidate TRPs, each channel matrix being used to indicate the channel state between its corresponding candidate TRP and the terminal.

Further, an available codebook may be calculated according to a plurality of channel matrices, where the available codebook refers to a codebook supporting coherent joint transmission. Specifically, the available codebook in this embodiment is calculated from the channel matrices of multiple candidate TRPs at the same time, so that multiple TRPs can be supported for coherent joint transmission.

In one non-limiting example, the terminal may first determine a plurality of TRPs participating in coherent joint transmission from the plurality of candidate TRPs, record the determined TRPs as transmission TRPs, and then calculate a feedback codebook according to channel matrices corresponding to the plurality of transmission TRPs. In other words, the transmission TRP is a TRP participating in coherent joint transmission.

Specifically, before calculating the codebook to be fed back, the terminal may determine the received power of the reference signal to be measured sent by each candidate TRP, and may use the candidate TRP with the received power of the reference signal to be measured greater than the preset power threshold as the first transmission TRP. The preset power threshold may be specified by a protocol, preset by the network side device or the terminal, or determined by negotiation between the terminal and the network side device, which is not limited by the present application. In other words, in the scheme of the embodiment of the present application, the plurality of candidate TRPs are configured by the network side device, and the terminal can determine whether each candidate TRP participates in coherent joint transmission according to the received power of the reference signal to be measured sent by the candidate TRP, that is, the terminal can determine whether the candidate TRP is a transmission TRP according to the received power of the reference signal to be measured sent by each candidate TRP.

If the number of the first transmission TRP is plural, an available codebook may be determined according to a channel matrix corresponding to the plural first transmission TRP.

If the number of the first transmission TRP is 1, a second transmission TRP may be selected from other candidate TRPs than the first transmission TRP among the plurality of candidate TRPs. The second transmission TRP may be a TRP with the highest received power of the reference signal to be measured, which is transmitted from the other candidate TRPs. Still further, the available codebook may be determined according to a channel matrix corresponding to the first transmission TRP and the second transmission TRP.

By adopting the scheme, the TRP which is not suitable for participating in the coherent joint transmission can be eliminated on the premise of realizing the coherent joint transmission of a plurality of TRPs, and the signaling overhead in the subsequent codebook feedback process is saved.

Further, the available codebook may be determined from a channel matrix of at least two of the plurality of TRPs. Specifically, the at least two TRPs may be the plurality of transmission TRPs, and the plurality of transmission TRPs may include only the first transmission TRP, and may also include the first transmission TRP and the second transmission TRP.

In a specific implementation, the structure of the calculated available codebook may be W _S ＝W _1,S ×W' _S ×W ^H _freq,S Wherein W is _S For the available codebook, W _1,S Is a space domain beam matrix, W _freq,S Is a frequency domain beam matrix, W ^H _freq,S Is W _freq,S Is the conjugate transpose of W' _S Is a linear weighting coefficient matrix.

More specifically, W _1,S The dimension of (2) may be N _TX ×(m×L)，Wherein m is the number of transmission TRP, L is the number of space beam vectors corresponding to each transmission TRP, each space beam vector is used for representing one space beam selected by the terminal, N _TX For the length of each spatial beam vector. In other words, the spatial beam matrix may include: l spatial beams selected for each transmission TRP. Wherein the L space beams selected for each transmission TRP can be marked as a space beam group, a space beam matrix W _1,S May contain m sets of spatial beams. It should be noted that each airspace beam group includes airspace beams in two polarization directions, where the number of airspace beams in each polarization direction may be L/2. Wherein the space beam group corresponds to the transmission TRP one by one.

Further, W _freq,S Where K is the number of frequency domain beam vectors, each frequency domain beam vector representing a frequency domain beam selected by the terminal, N is the length of each frequency domain beam vector, and K frequency domain beams may be denoted as a frequency domain beam group.

Further, W' _S May comprise a plurality of weighting coefficient matrices, in other words, a linear weighting coefficient matrix W' _S May be a concatenation of a plurality of weighting coefficient matrices. Specifically, a linear weighting coefficient matrix W' _S The dimension of each weighting coefficient matrix may be (m×l) ×k, where the dimension of each weighting coefficient matrix may be l×k, and the weighting coefficient matrix corresponds to one of the spatial beam groups and one of the frequency domain beam groups, where each coefficient in the weighting coefficient matrix corresponds to one of the spatial beam vectors and one of the frequency domain beam vectors of the spatial beam group to which the weighting coefficient matrix corresponds.

Note that N _TX And L, N and K are all preconfigured parameters, wherein the value of L can be 1 or a positive integer greater than 1.

Further, the terminal may determine parameter information (i.e., codebook feedback parameters) corresponding to each of the spatial domain beam matrix, the frequency domain beam matrix, and the linear weighting coefficient matrix in the available codebook.

Specifically, the codebook feedback parameter may include a first parameter, which may be parameter information corresponding to a spatial beam matrix, and the first parameter may be used to indicate at least two spatial beam groups, where the at least two spatial beam groups correspond to at least two TRPs, respectively.

More specifically, the first parameter may be used to instruct the terminal to select a set of spatial beams for each transmission TRP. The number of the spatial beams included in the plurality of spatial beam groups may be the same, and the number of the spatial beams may be preconfigured, that is, the number of the spatial beams is L.

In an implementation, the first parameter may include spatial parameters of a plurality of spatial beam groups, wherein the spatial parameters of each spatial beam group include: index information of the spatial beam group and a beam vector rotation factor (Beam rotation factor). Specifically, if the number of spatial beams in the spatial beam group is 1, the index of the spatial beam may be used as index information of the spatial beam group; if the number of spatial beams in the spatial beam group is plural, a combination coefficient (combinatorial coefficient) of index structures of the plural spatial beams may be used as index information of the spatial beam group. It should be noted that, the spatial beam set and the transmission TRP may be in one-to-one correspondence, and since the TRP and the reference signal to be measured are in one-to-one correspondence, the spatial beam set and the reference signal to be measured are also in one-to-one correspondence.

Accordingly, in S105, after receiving the first parameter, the network side device may determine, according to index information of each spatial beam group, an index of each spatial beam in the spatial beam group. Further, according to the index of each spatial beam in each spatial beam group and the beam vector rotation factor of the spatial beam group, each selected spatial beam can be finally determined, that is, a spatial beam matrix can be determined.

Further, the codebook feedback parameters may further include: and a third parameter, which may be parameter information corresponding to the frequency domain beam matrix, and which may be used to indicate at least one frequency domain beam group corresponding to the at least two TRPs. Specifically, the third parameter may include index information of the frequency domain beam group. More specifically, the plurality of transmission TRPs may be in a many-to-one correspondence with the frequency domain beam group, in other words, the plurality of transmission TRPs may correspond to the same frequency domain beam group, and the number of frequency domain beams in the frequency domain beam group may be preconfigured, that is, the number of frequency domain beams is K.

In a specific implementation, the third parameter may be fed back when the network side device indicates that the frequency domain beam matrix needs to be fed back. For example, the network side device or protocol may predefine the first frequency domain beam (i.e., the frequency domain beam with the smallest index) as the selected frequency domain beam, and if the network side device indicates that no feedback of the frequency domain beam matrix is needed when configuring the reference signal to be measured, the network side device and the terminal select the first frequency domain beam (i.e., the frequency domain beam with the smallest index) by default. By adopting the scheme, codebook feedback overhead is reduced.

If the network side device receives the third parameter, the selected frequency domain beam group can be determined according to the third parameter. If the network side device does not receive the third parameter, a predefined frequency domain beam, i.e. the first frequency domain beam, may be selected.

Further, the codebook feedback parameter may further include a second parameter, where the second parameter may be parameter information corresponding to the linear weighting coefficient matrix. In particular, the second parameter may be used for indicating parameter information of the weighting coefficient matrices corresponding to the at least two spatial beam groups. More specifically, the second parameter may be used to indicate the position, amplitude and phase of the non-zero coefficients in the weighting coefficient matrix corresponding to each spatial beam group.

In a specific embodiment, the second parameter may be obtained by performing differential computation according to a weighting coefficient matrix of the plurality of transmission TRPs, and the second parameter may include a position, an amplitude, and a phase of a non-zero coefficient in the weighting coefficient matrix corresponding to each spatial beam group. Whereby the second parameter may be indicative of a weighting coefficient matrix corresponding to each spatial beam group.

In one non-limiting example, the second parameter may include: the method comprises the steps of a position parameter, indexes of a plurality of reference coefficients, indexes of strongest coefficients, a plurality of groups of first differential parameters and a plurality of second differential parameters.

In particular, the location parameter may be used to indicate the location of all non-zero coefficients in a plurality of weighting coefficient matrices. More specifically, the location parameter may include a plurality of bitmaps that are in a one-to-one correspondence with the weighting coefficient matrices, each bitmap may be used to indicate the location of a respective non-zero coefficient in the corresponding weighting coefficient matrix in the weighting coefficient matrix.

Further, the reference coefficients and the weighting coefficient matrix are also in one-to-one correspondence, each reference coefficient may be a coefficient with the largest amplitude in the weighting coefficient matrix to which the reference coefficient belongs, and the index of the reference coefficient may be used to indicate the position of the reference coefficient in the weighting coefficient matrix to which the reference coefficient belongs.

Further, the strongest coefficient may refer to a reference coefficient having the largest magnitude among the plurality of reference coefficients, in other words, the strongest coefficient may be a coefficient having the largest magnitude among the linear weighting coefficient matrix. The index of the strongest coefficient may be used to indicate the position of the strongest coefficient among the plurality of reference coefficients. Therefore, the network side equipment can determine the position of the strongest coefficient in the linear weighting coefficient matrix according to the reference coefficient index and the strongest coefficient index.

In a specific implementation, the amplitude and phase of the strongest coefficient may be predefined, and in this case, the second parameter may not need to feedback the amplitude and phase of the strongest coefficient, which is beneficial to further reducing signaling overhead.

Further, the second differential parameters and the reference coefficients are in one-to-one correspondence, and each second differential parameter may be used to indicate a differential amplitude and a differential phase of the corresponding reference coefficient relative to the strongest coefficient. Wherein, the differential amplitude of the reference coefficient relative to the strongest coefficient refers to the difference between the amplitude of the reference coefficient and the amplitude of the strongest coefficient, and the differential phase of the reference coefficient relative to the strongest coefficient refers to the difference between the phase of the reference coefficient and the phase of the strongest coefficient. Thus, the network side device can determine the amplitude and the phase of each reference coefficient according to the second differential parameter and the amplitude and the phase of the strongest coefficient.

Further, the first differential parameters may be in one-to-one correspondence with the weighting coefficient matrix, and each set of the first differential parameters may be used to indicate a differential amplitude and a differential phase of other non-zero coefficients in the corresponding weighting coefficient matrix, except for the reference coefficient, relative to the reference coefficient in the weighting coefficient matrix. The differential amplitude of the other non-zero coefficients with respect to the reference coefficient refers to the difference in amplitude of the other non-zero coefficients with respect to the amplitude of the reference coefficient, and the differential phase of the other non-zero coefficients with respect to the reference coefficient refers to the difference in amplitude of the other non-zero coefficients with respect to the phase of the reference coefficient. Thus, the network side device can determine the amplitude and the phase of the non-zero coefficient in each weighting coefficient matrix according to the amplitude and the phase of the reference coefficient of the weighting coefficient matrix and a corresponding set of first differential parameters.

In S105, the network side device may determine the position, amplitude and phase of all non-zero coefficients in the linear weighting coefficient matrix through the above second parameter, thereby obtaining the linear weighting coefficient matrix.

In other embodiments, the second parameter may also be calculated by performing a differential calculation according to the polarization direction. In order to distinguish from the above-described second parameter obtained by the differential calculation according to TRP, the second parameter obtained by the differential calculation according to the polarization direction is hereinafter referred to as a second polarization parameter. Specifically, the linear weighting matrix may be split into a first polarization weighting coefficient matrix and a second polarization weighting coefficient matrix according to the polarization direction. Further, the second polarization parameter may be determined based on the first polarization weighting coefficient matrix and the second polarization weighting coefficient matrix, respectively.

Specifically, the second polarization parameters may include: a first sub-parameter that may be used to indicate the location of non-zero coefficients in each polarization weighting coefficient matrix; a second sub-parameter that may be used to indicate the position, amplitude and phase of the largest magnitude coefficient in each polarization weighting coefficient matrix; a third sub-parameter may be used to indicate the differential amplitude and differential phase of the non-zero coefficients in each polarization weighting coefficient matrix, except for the coefficient of greatest amplitude, relative to the coefficient of greatest amplitude.

It should be noted that, compared with the scheme of differentiating the second polarization parameter according to the polarization direction, the scheme of differentiating the linear weighting coefficient matrix according to the TRP to obtain the second parameter can more directly characterize coefficient information associated with each TRP in the linear weighting coefficient matrix, which is beneficial to simplifying the step of determining the codebook corresponding to each transmission TRP by the subsequent network side device, and is also convenient for discarding the codebook feedback parameter related to the transmission TRP with relatively poor channel state when the codebook feedback parameter is mapped to the feedback channel but the feedback channel is insufficient to bear all the feedback parameters.

In a specific implementation of S104, the terminal may map the codebook feedback parameters to a feedback channel to send the codebook feedback parameters to the base station. The feedback channel may be a channel between the terminal and the base station capable of data transmission. In other words, the feedback channel is not limited to the channels between the plurality of candidate TRPs and the terminal in this embodiment, and for example, the feedback channel may be a physical uplink shared channel (Physical Uplink Shared Channel, abbreviated PUSCH) channel.

In a specific embodiment, considering the resource limitation of the feedback channel, the situation that the codebook feedback parameters cannot be carried may occur, for this reason, in the scheme of this embodiment, the codebook feedback parameters are grouped according to priorities, the priorities of the codebook feedback parameters of the same group may be the same, the priorities of the codebook feedback parameters of different groups are different, and the codebook feedback parameters may be mapped to the feedback channel in order from high priority to low priority.

Specifically, all codebook feedback parameters may be divided into a first group, a second group, and a third group, and the codebook feedback parameters may be sequentially mapped to the feedback channels in the order of the first group, the second group, and the third group. That is, when the feedback parameters are mapped to the feedback channel, the codebook feedback parameters in the first group are mapped, the codebook feedback parameters in the second group are mapped, and the codebook feedback parameters in the third group are mapped. In other words, the priority of the codebook feedback parameters in group one is higher than the priority of the codebook feedback parameters in group two, and the priority of the codebook feedback parameters in group two is higher than the priority of the codebook feedback parameters in group three.

When the feedback channel cannot bear all codebook feedback parameters, the parameter sets can be sequentially discarded according to the order of the priority from low to high until the feedback channel can bear the codebook feedback parameters in the rest parameter sets. Specifically, when the parameter set needs to be discarded, the parameter set with lower priority is discarded first. More specifically, the codebook feedback parameters in group three are discarded first, and then the codebook feedback parameters in group two are discarded.

In a specific example, group one may include: a first parameter, an index of the strongest coefficient; group two may include: index of reference coefficient corresponding to at least one weighting coefficient matrix, first differential parameter and second differential parameter corresponding to the at least one weighting coefficient matrix; group three may include: index of reference coefficient corresponding to other weighting coefficient matrix except at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes, and first differential parameter and second differential parameter corresponding to the other weighting coefficient matrix. In other words, group three may include other parameters than group one and group two of the codebook feedback parameters.

The number of the at least one weighting coefficient matrix corresponding to the second group may be predefined, and the at least one weighting coefficient matrix corresponding to the second group may be a preset number of weighting coefficient matrices with the largest amplitude of the reference coefficient.

It should be noted that, in the solution of this embodiment, if the terminal needs to feed back the third parameter, the first group may further include: and a third parameter.

In another specific example, group one may include: the index of the first parameter, the index of the strongest coefficient and the indexes of the reference coefficients corresponding to the weighting coefficient matrixes; the second group comprises: the first differential parameter and the second differential parameter correspond to the at least one weighting coefficient matrix; group three includes: and the first differential parameters and the second differential parameters corresponding to the weighting coefficient matrixes except for the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes.

With the above scheme, codebook feedback parameters in the parameter sets with higher priority can provide relatively more important codebook information. Therefore, if the resource size of the feedback channel cannot bear all codebook feedback parameters, the parameter group with higher priority is preferentially borne. If the network side device receives the incomplete codebook feedback parameter, partial channel information related to a plurality of TRPs can be obtained, for example, the strongest TRP in the plurality of transmission TRPs can be determined according to the index of the strongest coefficient, the optimal airspace beam in the airspace beam group can be determined according to the reference coefficient, and the configuration and the scheduling of the subsequent coherent joint transmission are facilitated.

Further, in the solution of this embodiment, a resource index of the reference signal to be measured corresponding to at least one spatial beam group may also be sent. It should be noted that, the resource index of the reference signal to be measured corresponding to at least one spatial beam group may be sent before S104 is executed, the resource index of the reference signal to be measured corresponding to the at least one spatial beam group may be sent after S104 is executed and before S105 is executed, or the codebook feedback parameter and the resource index of the reference signal to be measured corresponding to the at least one spatial beam group may be sent simultaneously by using different channels, which is not limited in the embodiment of the present application.

Specifically, the at least one spatial beam set is at least a portion of the at least two spatial beam sets. When the number of the resource indexes of the reference signals to be measured transmitted by the terminal is plural, the transmission order of the resource indexes of the plural reference signals to be measured may be the same as the transmission order of the spatial parameters of the plural spatial beam groups.

More specifically, if the number of transmission TRPs is smaller than the number of candidate TRPs, the terminal may transmit a resource index of a reference signal to be measured corresponding to each spatial beam group. The network side device may determine a plurality of transmission TRPs according to the received resource indexes of the plurality of reference signals to be measured. Specifically, the terminal may send resource indexes of parameter signals to be measured corresponding to the plurality of transmission TRPs, so that the network side device may determine the TRPs participating in the coherent joint transmission. In other words, by transmitting the resource indexes of the parameter signals to be measured corresponding to the plurality of transmission TRPs, the network side device can be made aware of which candidate TRPs the received spatial beam group is the spatial beam group selected for.

If the number of transmission TRPs is equal to the number of candidate TRPs, denoted as m, the number of resource indexes of the parameter signal to be measured that the terminal can transmit to the network side device may be m-1. Specifically, the resource index of the reference signal to be measured corresponding to the last airspace beam group may not be sent to the network side device. The network side equipment can determine TRP corresponding to the last set of airspace beam groups based on the resource indexes of m-1 reference signals to be measured, wherein m is a positive integer and m is more than or equal to 2. With such a scheme, signaling overhead is advantageously reduced.

When the number of the resource indexes of the reference signals to be measured transmitted by the terminal is plural, the transmission order of the resource indexes of the plural reference signals to be measured may be the same as the transmission order of the spatial parameters of the plural spatial beam groups. Because the sending sequence of the airspace parameters of the airspace beam groups and the sequence of the resource indexes of the reference signals to be measured are the same, the network side equipment can determine the corresponding relation between the airspace parameters of the received groups and the TRP according to the received sequence of the resource indexes of the reference signals to be measured and the corresponding relation between the reference signals to be measured and the TRP.

Therefore, after the network side equipment receives the resource index of the reference signal to be measured sent by the terminal, a plurality of transmission TRPs can be determined according to the received resource index, and TRPs corresponding to the space domain parameters of the plurality of space domain beam groups in the first parameter can be determined.

In a specific implementation of S105, the network side device may determine a feedback codebook of at least two TRPs according to the codebook feedback parameter, that is, the network side device may determine an available codebook when the at least two TRPs perform coherent joint transmission according to the codebook feedback parameter, where the at least two TRPs are a plurality of transmission TRPs above.

Specifically, the network side device may restore based on the codebook feedback parameter to obtain the spatial beam matrix, the frequency domain beam matrix and the linear weighting coefficient matrix, where the three matrices are multiplied to obtain the available codebook under the scenario of multiple TRP coherent joint transmission.

Further, the network side device may split the feedback codebook applicable to each TRP participating in coherent joint transmission (i.e., transmitting TRP) based on the whole available codebook. Wherein the feedback codebook to which each transmission TRP is applicable may be a sub-codebook of the entire available codebook.

By the above, after the terminal sends the codebook feedback parameters to the network side device, the network side device can determine the available codebook when the plurality of TRPs perform coherent joint transmission according to the codebook feedback parameters.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a codebook feedback apparatus for TRP according to an embodiment of the present application, and the apparatus shown in fig. 2 may include:

an acquisition module 21, configured to acquire a reference signal to be measured, where the reference signal to be measured is used to measure channel states of a plurality of TRPs;

the parameter generating module 22 is configured to measure the reference signal to be measured, and determine codebook feedback parameters according to a measurement result, where the codebook feedback parameters include: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups;

and a sending module 23, configured to send the codebook feedback parameter.

For more matters such as the working principle, the working method and the beneficial effects of the codebook feedback device for multiple TRP in the embodiment of the present application, reference may be made to the above description about the codebook feedback method for TRP, which is not repeated here.

In a specific implementation, the codebook feedback device for multiple TRP may correspond to a Chip having a feedback parameter generating function in a terminal, or to a Chip having a data processing function, such as a System-On-a-Chip (SOC), a baseband Chip, etc.; or corresponds to a chip module comprising a chip with a feedback parameter generation function in the terminal; or corresponds to a chip module having a chip with a data processing function, or corresponds to a terminal.

Referring to fig. 3, fig. 3 is a codebook determining apparatus for multi-TRP in an embodiment of the present application, and the determining apparatus shown in fig. 3 may include:

the receiving module 31, configured to receive the codebook feedback parameter includes: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups;

a determining module 32, configured to determine a feedback codebook of the at least two TRPs according to the codebook feedback parameter;

wherein the codebook feedback parameter is determined according to a measurement result of channel states of the plurality of TRPs.

For more details of the operation principle and operation manner of the codebook determining apparatus for multi-TRP shown in fig. 3, reference may be made to the description related to fig. 1, and details thereof are not repeated here.

In a specific implementation, the codebook determining apparatus for multiple TRP described above may correspond to a chip having a codebook calculation function in a network side device, or to a chip having a data processing function, such as an SOC, a baseband chip, or the like; or corresponds to a chip module which comprises a chip with a codebook calculation function in the network side equipment; or corresponds to a chip module having a data processing function chip or corresponds to a network side device.

In a specific implementation, regarding each apparatus and each module/unit included in each product described in the above embodiments, it may be a software module/unit, or a hardware module/unit, or may be a software module/unit partially, or a hardware module/unit partially.

For example, for each device or product applied to or integrated on a chip, each module/unit included in the device or product may be implemented in hardware such as a circuit, or at least part of the modules/units may be implemented in software program, where the software program runs on a processor integrated inside the chip, and the rest (if any) of the modules/units may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module/unit contained in the device and product can be realized in a hardware manner such as a circuit, different modules/units can be located in the same component (such as a chip, a circuit module and the like) or different components of the chip module, or at least part of the modules/units can be realized in a software program, the software program runs on a processor integrated in the chip module, and the rest (if any) of the modules/units can be realized in a hardware manner such as a circuit; for each device, product, or application to or integrated with the terminal, each module/unit included in the device, product, or application may be implemented by using hardware such as a circuit, different modules/units may be located in the same component (for example, a chip, a circuit module, or the like) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program, where the software program runs on a processor integrated inside the terminal, and the remaining (if any) part of the modules/units may be implemented by using hardware such as a circuit.

Embodiments of the present application also provide a computer readable storage medium, which is a non-volatile storage medium or a non-transitory storage medium, on which a computer program is stored, which when executed by a processor performs the steps of the method provided by the embodiment shown in fig. 1 described above.

Preferably, the computer-readable storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory.

Referring to fig. 4, another codebook feedback apparatus for multi-TRP is provided according to an embodiment of the present application, which includes a memory 41 and a processor 42, where the processor 41 and the memory 42 are coupled, and the memory 41 may be located inside the apparatus or may be located outside the apparatus. The memory 41 and the processor 42 may be connected by a communication bus. The memory 41 stores a computer program executable on the processor 42, and the processor 42 executes the steps in the multi-TRP codebook feedback method provided in the above embodiment when the computer program is executed, where the codebook feedback device for multi-TRP may be the terminal above.

The embodiment of the application also provides another codebook determining device for multiple TRPs, which comprises a memory and a processor, wherein the processor is coupled with the memory, and the memory can be positioned in the device or positioned outside the device. The memory and the processor may be connected by a communication bus. The memory has stored thereon a computer program executable on the processor. Unlike another codebook feedback apparatus for multi-TRP shown in fig. 4, the processor in the codebook determination apparatus for multi-TRP, which may be the network-side device (e.g., may be a base station) above, performs the steps in the codebook determination method for multi-TRP provided in the above embodiment when the processor runs the computer program.

Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be implemented by a program that directs a computer to perform the steps in the associated hardware

It should be appreciated that in the embodiment of the present application, the processor may be a central processing unit (central processing unit, abbreviated as CPU), and the processor may also be other general purpose processors, digital signal processors (digital signal processor, abbreviated as DSP), application specific integrated circuits (application specific integrated circuit, abbreviated as ASIC), off-the-shelf programmable gate arrays (field programmable gate array, abbreviated as FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be appreciated that the memory or storage medium in embodiments of the application may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically erasable ROM (electrically EPROM, EEPROM), or a flash memory. The volatile memory may be a random access memory (random access memory, RAM for short) which acts as an external cache. By way of example and not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (double data rate SDRAM, DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (direct rambus RAM, DR RAM)

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer program may be stored in or transmitted from one computer readable storage medium to another, for example, by wired or wireless means from one website, computer, server, or data center.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other manners. For example, the device embodiments described above are merely illustrative; for example, the division of the units is only one logic function division, and other division modes can be adopted in actual implementation; for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.

The term "plurality" as used in the embodiments of the present application means two or more. The first, second, etc. descriptions in the embodiments of the present application are only used for illustrating and distinguishing the description objects, and no order is used, nor is the number of the devices in the embodiments of the present application limited, and no limitation on the embodiments of the present application should be construed.

Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the application, and the scope of the application should be assessed accordingly to that of the appended claims.

Claims

1. A codebook feedback method for multiple transmission reception points TRP, the method being applied to a terminal and comprising:

acquiring a reference signal to be measured, wherein the reference signal to be measured is used for measuring channel states of a plurality of TRPs;

measuring the reference signal to be measured, and determining codebook feedback parameters according to a measurement result, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two space-domain beam groups, the at least two space-domain beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two space-domain beam groups, and the at least two TRPs are at least two TRPs in the plurality of TRPs;

and sending the codebook feedback parameters.

2. The codebook feedback method for multiple TRP according to claim 1, wherein the codebook feedback parameters further comprise: a third parameter for indicating at least one frequency domain beam group, the at least one frequency domain beam group corresponding to the at least two TRPs.

3. The codebook feedback method for multiple TRP according to claim 1 or 2, wherein the first parameter comprises: index information and beam vector rotation factors for each spatial beam group.

4. A codebook feedback method for multiple TRP according to any one of claims 1 to 3, wherein the method further comprises:

transmitting a resource index of a reference signal to be measured corresponding to at least one airspace beam group; wherein the at least one spatial beam set is at least a portion of the at least two spatial beam sets.

5. The codebook feedback method for multiple TRP according to any one of claims 1 to 4, wherein the second parameter comprises:

the position, amplitude and phase of the non-zero coefficients in the weighting coefficient matrix corresponding to each spatial beam group.

6. The codebook feedback method for multiple TRP according to any one of claims 1 to 5, wherein the second parameter comprises:

the position parameters are used for indicating the positions of non-zero coefficients in the weighting coefficient matrixes corresponding to the at least two airspace beam groups;

index of multiple reference coefficients corresponding to multiple weighting coefficient matrixes, wherein the index of each reference coefficient is used for indicating the position of the reference coefficient in the weighting coefficient matrix to which the reference coefficient belongs, and each reference coefficient is the coefficient with the largest amplitude in the weighting coefficient matrix to which the reference coefficient belongs;

Each group of first differential parameters is used for indicating the differential amplitude and the differential phase of other non-zero coefficients except the reference coefficient in the corresponding weighting coefficient matrix relative to the reference coefficient;

an index of a strongest coefficient, the index of the strongest coefficient being used to indicate a position of the strongest coefficient among the plurality of reference coefficients, wherein the strongest coefficient is a reference coefficient with a largest magnitude among the plurality of reference coefficients;

and a plurality of second differential parameters corresponding to the plurality of weighting coefficient matrixes, wherein each second differential parameter is used for indicating the differential amplitude and the differential phase of the reference coefficient relative to the strongest coefficient in the corresponding weighting coefficient matrix.

7. The codebook feedback method for multiple TRP according to claim 6, wherein transmitting the feedback parameters comprises:

sequentially mapping the codebook feedback parameters to feedback channels according to the sequence of the first group, the second group and the third group and sending the codebook feedback parameters;

wherein group one includes: an index of the first parameter, the strongest coefficient;

the second group comprises: index of reference coefficients of at least one weighting coefficient matrix, a first differential parameter and a second differential parameter of the at least one weighting coefficient matrix;

Group three includes: index of reference coefficient of other weighting coefficient matrix except the at least one weighting coefficient matrix, first differential parameter and second differential parameter of the other weighting coefficient matrix in the plurality of weighting coefficient matrixes;

alternatively, group one includes: the first parameter, the index of the strongest coefficient, and the index of the plurality of reference coefficients;

the second group comprises: a first differential parameter and a second differential parameter of at least one weighting coefficient matrix;

group three includes: a first differential parameter and a second differential parameter of other weighting coefficient matrices of the plurality of weighting coefficient matrices than the at least one weighting coefficient matrix.

8. The codebook feedback method for multiple TRP according to claim 1, wherein the number of reference signals to be measured is plural, the reference signals to be measured and the TRPs are in one-to-one correspondence, and each reference signal to be measured is transmitted by the TRP corresponding thereto.

9. A codebook feedback apparatus for multiple TRP, the apparatus comprising:

the acquisition module is used for acquiring a reference signal to be measured, wherein the reference signal to be measured is used for measuring channel states of a plurality of TRPs;

The parameter generation module is used for measuring the reference signal to be measured and determining codebook feedback parameters according to the measurement result, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two space-domain beam groups, the at least two space-domain beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two space-domain beam groups, and the at least two TRPs are at least two TRPs in the plurality of TRPs; and the sending module is used for sending the codebook feedback parameters.

10. A codebook determining method for multiple transmission reception points TRP, the method being applied to a network side device and comprising:

receiving codebook feedback parameters, wherein the codebook feedback parameters comprise: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups;

determining a feedback codebook of the at least two TRPs according to the codebook feedback parameter;

Wherein the codebook feedback parameter is determined according to a measurement result of channel states of a plurality of TRPs, and the at least two TRPs are at least two TRPs of the plurality of TRPs.

11. The codebook determination method for multiple TRP according to claim 10, wherein prior to receiving the codebook feedback parameter, the method further comprises:

transmitting a reference signal to be measured and indicating to perform codebook feedback;

wherein the reference signal to be measured is used for measuring channel states of the plurality of TRPs.

12. The codebook determination method for multiple TRP according to claim 11, wherein the number of reference signals to be measured is plural, the reference signals to be measured and the TRPs are in one-to-one correspondence, and each reference signal to be measured is transmitted by the TRP corresponding thereto.

13. The codebook determination method for multiple TRP according to any one of claims 10 to 12, wherein the codebook feedback parameter further comprises: a third parameter for indicating at least one frequency domain beam group, the at least one frequency domain beam group corresponding to the at least two TRPs.

14. The codebook determination method for multiple TRP according to any one of claims 10 to 13, wherein the first parameter comprises: index information and beam vector rotation factors for each spatial beam group.

15. The codebook determination method for multiple TRP according to any one of claims 10 to 14, wherein the method further comprises:

receiving a resource index of a reference signal to be measured corresponding to at least one airspace beam group; wherein the at least one spatial beam set is at least a portion of the at least two spatial beam sets.

16. The codebook determination method for multiple TRP according to any one of claims 10 to 15, wherein the second parameter comprises:

17. The codebook determination method for multiple TRP according to any one of claims 10 to 16, wherein the second parameter comprises:

the position parameters are used for indicating the positions of non-zero coefficients in a plurality of weighting coefficient matrixes corresponding to the at least two airspace beam groups;

18. The codebook determination method for multiple TRP according to claim 17, wherein the feedback parameters are mapped to feedback channels sequentially in the order of group one, group two, and group three and transmitted;

the second group comprises: index of reference coefficient corresponding to at least one weighting coefficient matrix, first differential parameter and second differential parameter of the at least one weighting coefficient matrix;

Group three includes: index of reference coefficient corresponding to other weighting coefficient matrixes except the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes, and first differential parameter and second differential parameter of the other weighting coefficient matrixes;

alternatively, group one includes: the first parameter, the index of the strongest coefficient and the indexes of the reference coefficients corresponding to the weighting coefficient matrixes;

the second group comprises: the first differential parameter and the second differential parameter correspond to the at least one weighting coefficient matrix;

group three includes: and the first differential parameters and the second differential parameters corresponding to the weighting coefficient matrixes except for the at least one weighting coefficient matrix in the plurality of weighting coefficient matrixes.

19. A codebook determining apparatus for multiple transmission reception points TRP, the apparatus comprising:

the receiving module is configured to receive the codebook feedback parameter, including: a first parameter and a second parameter, wherein the first parameter is used for indicating at least two airspace beam groups, the at least two airspace beam groups respectively correspond to at least two TRPs, and the second parameter is used for indicating a weighting coefficient matrix corresponding to the at least two airspace beam groups;

A determining module, configured to determine a feedback codebook of the at least two TRPs according to the codebook feedback parameter; wherein the feedback codebook is determined according to a measurement result of channel states of a plurality of TRPs, and the at least two TRPs are at least two TRPs of the plurality of TRPs.

20. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when run by a processor, causes the steps of the codebook feedback method for multi-TRP according to any one of claims 1 to 8 or the steps of the codebook determination method for multi-TRP according to any one of claims 10 to 18 to be performed.

21. Codebook feedback device for multi-transmission reception points TRP, comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor executes the steps of the codebook feedback method for multi-TRP according to any of claims 1 to 8 when the computer program is executed by the processor.

22. Codebook determining device for multi-transmission reception points TRP, comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor executes the steps of the codebook determining method for multi-TRP according to any of claims 10 to 18 when the computer program is executed by the processor.